Bit holder



March 15, 19% T. v. WILLXAMS ,2

BIT HQLDER Filed Nov. 20, 1962 2 Sheets-Sheet l INVENTOR jxazizflm K Willa/72;;

W66 T. v. WILLIAMS 333%M BIT HOLDER Filed NOV. 20, 1962 2 Sheets-Sheet 2 United States Patent 3,239,911 BIT HOLDER Thurston V. Williams, Wilton, N.H., assignor to The (Mi. Tooi Company, lino, Milford, N.H., a corporation of New Hampshire Fiied Nov. 21), 1962, Ser. No. 238,942 17 Claims. ($1. 29-96) This application is a continuation-in-part of application Serial No. 198,823, filed May 31, 1962, now abancloned.

While this invention is particularly applicable to endfacing tools, it is also useful in other tools such as milling cutters, lathes, etc.

Objects of the invention are to provide a bit locator which is simple and economical in construction, which will fit existing tools having recesses to receive holders of the bit-and-clamp type, which can be mounted and adjusted from one side of a tool, which affords micrometer adjustment of a bit in each of two directions, which can be adjusted and clamped quickly and easily, and which is durable and reliable in use.

In one aspect the present invention comprises a bit locator for use in tools rovided with a bit recess having a bottom and two sides such as the well-known milling head having a series of such recesses around its periphery. The locator may be sold with a milling head or other carrier, or it may be sold separately for use in existing tools having the usual recesses. The locator has a shoulder facing away from said bottom to prevent movement of the bit toward said bottom, a screw threaded through said locator and seating on said bottom to adjust the position of the locator relatively to said bottom.,ihe locator including a wedge to lock the bit in the recess, and a second screw in the locator for actuating the wedge. The aforesaid shoulder may extend at right angles to the locator or it may be sloping as a serration. The locator may have a bifurcation so that it can be expanded relatively to the aforesaid sides and the wedge may comprise a tapered head on the second screw for spreading the bifurcation. Preferably the second screw extends through the locator and threads into the aforesaid bottom for interconnecting the locator with the carrier.

In another aspect the invention involves a rotary head or other carrier movable in a predetermined direction, the carrier having a recess defined by a bottom and two sides, one side facing in the aforesaid direction and the other side facing in the opposite direction and, in the aforesaid recess, a bit holder bearing on one of said sides and a locator bearing on the other of said sides, said holder and locator having abutting surfaces to prevent movement of the holder relatively to the locator toward said bottom, a screw extending through the locator into engagement with said bottom to adjust the holder and locator relatively to said bottom and means for locking the locator in adjustedposition. Preferably the holder has a bifurcation in one end dividing it into two sections with a bit recess therebetween, and means for forcing said sections together to clamp a bit therebetween. Said last means may comprise a screw extending through one section and threading into the other section. Preferably the means for locking the locator in adjusted position comprises a screw extending through the locator and threading into the aforesaid carrier. The aforesaid locking means preferably comprises a Wedge for clamping the locator against the holder. The locator may have a bifurcation and the aforesaid locking means may comprise a tapered screw for spreading the bifurcation. The adjusting and locking screws may be coaxial or they may be offset relatively to each other lengthwise of the recess.

In a more specific aspect the tool comprises a carrier 3,239,911 Patented Mar. 15, 1966 movable in a predetermined direction, the carrier having a recess defined by a bottom, end and two sides, one side facing in said direction and the other side facing in the opposite direction, in the recess a bit holder bearing on one of the sides and a locator bearing on the other of the sides, the holder and locator having abutting surfaces to prevent movement of the holder relatively to the locator toward the bottom, a screw extending through the locator into engagement with the bottom to afford a micrometer adjustment of the holder and locator relatively to the bottom, a screw bridging the space between the aforesaid end and the opposing end of the holder, the screw being threaded into one of the ends and bearing on the other end to afford a micrometer adjustment of the holder relatively to the first end, and means for locking the locator in adjusted position.

For the purpose of illustration typical embodiments of the invention are shown in the accompanying drawings in which FIG. 1 is a side elevation;

FIG. 2 is an end elevation;

FIG. 3 is a section on line 33 of FIG. 1;

FIG. 4 is a section on line 44 of FIG. 1;

FIG. 5 is a view like FIG. 1 showing a modification;

FIG. 6 is a view like FIG. 2 showing the same modification;

FIG. 7 is a section on line 7-7 of FIG. 5;

FIG. 8 is a section on line 8-8 of FIG. 5;

FIG. 9 is a view like FIG. 1 showing another modification;

FIG. 10 is a section on line 10-10 of FIG. 9; and

FIG. 11 is a view like FIG. 9 showing another modification.

The particular embodiment of the invention shown in FIGS. 1 to 4 comprises a rotating carrier 1 turning in the direction of the arrow in FIG. 2. Distributed around the periphery of the carrier is a series of recesses. each having a bottom 2, a side 3 facing in the direction of rotation, a side 4 facing in the opposite direction and an end 6. Disposed in each recess is a bit holder 7 and an L-shaped locator 8, the base of the locator facing the bottom of the recess and the upright of the locator extending along the aforesaid side 3. The upright has a longitudinal slot 9 extending from its outer end toward the bottom of the recess. Extending from the bottom of the slot through the bottom of the locator are threaded bores to receive screws 11. In its outer end the locator has larger bores in alignment with the aforesaid bores to receive screws 12. Extending through each screw 12 is an axial opening 13 through which a screwdriver may be inserted to turn the screw 11, the outer end of this opening being shaped to receive an Allen wrench.

The bit holder 7 has a bifurcation 14 dividing it into two sections with a recess therebetween to receive an L-shaped bit 16 (FIG. 3). A screw 17 extends through one of the aforesaid sections and threads into the other section for drawing the two sections together to clamp the bit in place. As shown in the drawing one side of the bit and one of the aforesaid sections may have serrations extending axially of the carrier to interlock the bit and holder. Threaded into the inner end of the bit holder is a screw 18 bearing on the aforesaid end 6 of the recess, the screw being locked in position by a set screw 19.

In operation the bit is clamped in the holder 7 with the screw 17 and the parts are placed in the recess. The extent to which the bit projects from the end of the carrier is adjusted with the screw 18. The extent to which the bit projects radially is adjusted by means of the screws 11. Then the screws 12 are tightened to clamp the parts in adjusted position.

The embodiment shown in FIGS. to 8 is similar to that shown in FIGS. 1 to 4 and corresponding parts are correspondingly numbered. However, instead of the L- shaped locator 8, the holder 27 is interlocked with the locator 28 by means of serrations 29. In lieu of the coaxial adjusting screws 11 and clamping screws 13, the adjusting screws 21 and clamping screws 22 are offset lengthwise of the bifurcation 9. Moreover the adjusting screws 21 thread into the carrier 1 so as to hold the locator and holder in adjusted positions positively.

The modification shown in FIGS. 9 and is similar to that shown in FIGS. 5 to 8 except in that the clamping screws 22 are replaced by clamping screws 32 actuating a wedge 33 hearing on an inclined surface of the locator 38. A spring 34 may be provided to urge the wedge 33 outwardly when the screw 32 is retracted.

The modification shown in FIG. 11 is like that shown in FIGS. 5 to 8 except that the locator 28 is replaced by two locators 48 which are semi-cylindrical. They are ad justable toward and from the bottom of the recess of the carrier 1 by means of screws 41 corresponding to 21 of FIGS. 5 to 8 and they are locked in adjusted position by means of screws 42 corresponding to screws 22 in FIGS. 5 to 8. The bifurcation in the locator may extend lengthwise of the bit recess as shown at 49 or it may extend obliquely as shown at 50. As shown in FIG. 11 the bit holder, 7 in FIGS. 1 to 4, 27 in FIGS. 5 to 8 and 37 in FIGS. 9 and 10, may be eliminated and the locators may bear directly on the bit 16. Thus the means carrying the cutting edge may comprise a bit and holder as in FIGS. 1 to 10 or only a bit as in FIG. 11.

As shown in FIGS. 1 to 10 the interengaging faces of the bit and holder may be serrated to provide shoulders to hold the bit in place, and in FIG. 11 the bit 16 and locators 48 are serrated to provide such shoulders.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equiavlents which fall within the scope of the appended claims.

I claim:

1. For use in a tool provided with a bit recess having a bottom and two sides, a locator having a shoulder facing away from said bottom to prevent movement of the bit toward said bottom, a screw threaded through said locator and seating on said bottom to adjust the position of the locator relatively to said bottom, the locator including means to lock the bit in the recess, and a second screw in the locator for actuating said means.

2. For use in a tool provided with a bit recess having a bottom and two sides, a locator having a shoulder facing away from said bottom to prevent movement of the bit toward said bottom, a screw threaded through said locator and seating on said bottom to adjust the position of the locator relatively to said bottom, the locator having a bifurcation so that it can be expanded relatively to said sides, and a second screw in the locator for spreading the bifurcation.

3. A tool comprising a carrier provided with a bit recess having a bottom and two sides, a locator having a shoulder facing away from said bottom to prevent movement of the bit toward said bottom, a screw threaded through said locator and seating on said bottom to adjust the position of the locator relatively to said bottom, the locator including means to lock the bit in the recess, and a second screw extending through the locator and threading into said bottom for actuating said means and interconnecting the locator with the carrier.

4. A tool comprising a carrier provided with a bit recess having a bottom and two sides, a bit in the recess, a locator having a shoulder facing away from said bottom to prevent movement of the bit toward said bottom and providing a cutting element seat, a screw threaded through said locator and seating on said bottom to adjust the position of the locator relatively to said bottom, the locator having a bifurcation so that it can be expanded relatively to said sides, and a second screw extending through said bifurcation and threading into said bottom for spreading the bifurcation and interconnecting the locator with the carrier.

5. A tool comprising a carrier movable in a predetermined direction, the carrier having a recess defined by a bottom and two sides, one side facing in said direction and the other side facing in the opposite direction, in said recess a bit holder bearing on one of said sides and a locator bearing on the other of said sides, said holder and locator having abutting surfaces to prevent movement of the holder relatively to the locator toward said bottom, a screw extending through the locator into engagement with said bottom to adjust the holder and locator relatively to said bottom and means for locking the locator in adjusted position.

6. A tool according to claim 5 wherein the holder has a bifurcation in one end dividing it into two sections with a bit recess therebetween, and means for forcing said sections together to clamp a bit therebetween.

7. A tool according to claim 6 wherein said last means comprises a screw extending through one section and threading into the other section.

8. A tool according to claim 5 wherein said last means comprises a screw extending through the locator and threading into said carrier.

9. A tool according to claim 5 wherein said last means comprises a wedge for clamping the locator against the holder.

10. A tool according to claim 5 wherein the locator has a bifurcation and said last means comprises a tapered screw for spreading the bifurcation.

11. A tool according to claim 10 wherein said screws are coaxial.

12. A tool according to claim 10 wherein said screws are offset relatively to each other lengthwise of the recess.

13. A tool comprising a carrier movable in a predetermined direction, the carrier having a recess defined by a bottom, end and two sides, one side facing in said direction and the other side facing in the opposite direction, in said recess a bit holder bearing on one of said sides and a locator bearing on the other of said sides, said holder and locator having abutting surfaces to prevent movement of the holder relatively to the locator toward said bottom, a screw extending through the locator into engagement with said bottom to afford a micrometer adjustment of the holder and locator relatively to said bottom, a screw bridging the space between said end and the opposing end of the holder, the screw being threaded into one of said ends and bearing on the other end to afford a micrometer adjustment of the holder relatively to said first end, and means for locking the locator in adjusted position.

14. A tool according to claim 13 wherein the holder has a bifurcation in one end dividing it into two sections with a bit recess therebetween, and means for forcing said sections together to clamp a bit therebetween.

15. A tool according to claim 14 wherein said last means comprises a screw extending through one section and threading into the other section.

16. A tool comprising a carrier movable in a predetermined direction, the carrier having a recess defined by a bottom and two sides, one side facing in said direction and the other side facing in the opposite direction, in said recess a bit bearing on one of said sides and a locator bearing on the other of said sides, said bit and locator having abutting surfaces to prevent movement of the bit relatively to the locator toward said bottom, a screw extending through the locator into engagement with said bottom to adjust the bit and locator relatively to said bottom and means for locking the locator in adjusted position.

17. A tool comprising a carrier provided with a bit recess having a bottom and two sides, a bit in the recess, a locator having a shoulder facing away from said bottom to prevent movement of the bit toward said bottom and providing a cutting element seat, a screw threaded through said locator and seating on said bottom to adjust the position of the locator relatively to said bottom, the locator having a bifurcation so that it can be expanded relatively to said sides, and a second screw extending through said bifurcation and threading into said bottom for spreading the bifurcation and interconnecting the lo- 10 cator with the carrier, one side of the locator being straight in cross section and the opposite side being semicylindrical.

References Cited by the Examiner UNITED STATES PATENTS Ottersland.

Kralowetz 29-105 Leuzinger.

Knell 29-105 Sweet 29-97 Greenleaf 189-36 Titsler 189-36 Williams 29-96 Payne 29-96 WILLIAM W. DYER, ]R., Primary Examiner. 

1. FOR USE IN A TOOL PROVIDED WITH A BIT RECESS HAVING A BOTTOM AND TWO SIDES, A LOCATOR HAVING A SHOULDER FACING AWAY FROM SAID BOTTOM TO PREVENT MOVEMENT OF THE BIT TOWARD SAID BOTTOM, A SCREW THREADED THROUGH SAID LOCATOR AND SEATING ON SAID BOTTOM TO ADJUST THE POSITION OF THE LOCATOR RELATIVELY TO SAID BOTTOM, THE LOCATOR INCLUDING MEANS TO LOCK THE BIT IN THE RECESS, AND A SECOND SCREW IN THE LOCATOR FOR ACTUATING SAID MEANS. 